Motorhead

Ian "Lemmy" Kilmister has remained the sole constant as Motorhead became one of rock's most important bands. Considered a forefather of the New Wave of British Heavy Metal, Motorhead has sold more than 30 million albums since its founding in 1975 -- reaching a high-water mark at the turn of the '80s with the UK-charttopping 'No Sleep 'til Hammersmith.' Their nifty incorporation of punk influences also helped spark the speed metal and thrash metal genres. Phil Campbell and Mikkey Dee joined Motorhead in 1995, creating Motorhead's longest-tenured lineup. Prior to his co-founding Motorhead, Lemmy was a member of space-rock pioneers Hawkwind from 1972-75 -- where he first took up the bass -- and also worked as a roadie with <a href="http://ultimateclassicrock.com/jimi-hendrix/">Jimi Hendrix</a> in the late '60s.